Sometimes traces of the program remain when you uninstall. download and run revo uninstaller to remove all traces of the program, including registry entries, and try to install again. Worked for me, but be careful as it will alter the registry.

Sometimes traces of the program remain when you uninstall. download and run revo uninstaller to remove all traces of the program, including registry entries, and try to install again. Worked for me, but be careful as it will alter the registry.

You were right. Thank God I had Revo installed ^^
Thanks!

EDIT:
Managed to install it but this error still pops-up... Omg I'll never sync my music to my 8X.
Any ideas on how to fix it...?

Tbh I ditched the app and just use wmp to sync my music and playlists. Works a lot better as long as you don't have a music pass, but still far from perfect. Hopefully MS are busy working on a proper solution to the multitude of issues people are having.

Tbh I ditched the app and just use wmp to sync my music and playlists. Works a lot better as long as you don't have a music pass, but still far from perfect. Hopefully MS are busy working on a proper solution to the multitude of issues people are having.

Do you have any idea on how to turn Zune's playlists into WMP's? I don't want to re-add all of my songs :/ Thank you for everything. I hope Microsoft does the same.
One last question. Do I need a Music Pass (or pay) to actually use XBOX Music? Isn't it just like Zune? Listen to music but if you want to get more music you pay? If so how do I download it because it asks me sign up for a pass...

I think you just need to change the extension of the playlist files and move them across to wmp's playlist folder. Zune playlist files are .zpl and wmp playlists are .wpl. There are a few guides if you search. Not sure about Xbox music as I don't use it, but I think you can only stream for free on Xbox and PC.